FM 23-36 Revolver, Colt, Caliber .45, M1917 and Revolver, Smith and Wesson, Caliber .45, M1917 1941-10-20
"The Colt revolver, caliber .45, M1917, and the Smith and Wesson revolver, caliber .45. M1917, are single shot, breech loading hand weapons. Each Is provided with a cylinder having six chambers arranged about a central axis so that six shots may be fired before reloading is necessary. Both weapons may be fired either single action or double action. Single and double action for these revolvers is described in detail in section IV."